Perforator for printing presses



June- 22, 1937. P. w. cowAN PERFORATOR FOR PRINTING PPESSES Filed May 13, l195e;

Patented June 22, 1937' UNITED STATES PATENT oFFlcE Application May 13,

11 Claims.

My invention relates to rotary perforators used in connection with printing presses to perforate the paper passing over a roll, the rotary perforator cutting through the paper while in contact with the roll.

In this type of device an object andfeature of my invention resides in a carrier or holder having one portion with a notch or groove for attachment to a supporting bar and a block pivoted 1-0 thereto, the cutting implement being adjustably mounted on the block in order to bring the perforating wheel or disc into proper engagement with the paper to be perforated. In this connection the block pivotally mounted on the lower part t of the carrier is restrained by a screw from moving in one direction but held in adjusted position by a spring, which spring may yield to allow the block and hence the perforating wheel or disc to move in the direction of the compression of the spring.

Another feature of my invention as it relates to the mounting of the perforating wheel or disc is having the block portion of the carrier or holder provided with a longitudinal guide opening preferably square in cross section in which is adjustably mounted a shank having the perforating disc on one end. This shank has screw threads thereon and is operated by an impression nut which fits in a transverse notch in the holder block, the shank being locked by a lock nut. Anotherfdetail feature in this regard is providing the shank with a yoke on the end through the arms of which extends an axle bolt forming the axle on which the perforating disc or wheel rotates.

yAnother' object and feature of my invention 'is in an anti-friction, such as a ball bearing mounting, for the perforating wheel or disc, this mounting being of such construction that the perforating portion of the disc may be readily removed and replaced by another perforating element in order to obtain a variation in the number of perforations per unit of length.

A further feature of my invention relates to the anti-friction or ball bearing mounting for the removable and replaceable perforating discs or rings. In this arrangement the inner race of the bearing ts on the axle mounted in the yoke on the shank, the outer race having a protective guard and the bearing is formed with a collar race.

I secure asleeve with an annular flange to the collar of the ball bearing. The portion of the sleeve at one side ofthe flange is tilted and on having a tight iit with the guard and the outer` thisis threaded an 'annular ringeor removable 1936, Serial No. 79,516

flange which is used to clamp or secure the ring forming the perforating disc attached to the sleeve. The perforating ring is caught by a pin and perforation connection to the fixed iiange of the sleeve and as the removable ange is easily attached and detached, provision is made for quickly changing the perforating discs to vary the number of spaces per unit of length.

A further feature of my invention is in the employment of an angle shaped bar pivoted at its ends in the frame of the press and hence adjustable as to angularity for supporting the series of holder blocks having perforations.

My invention is illustrated in connection with the accompanying drawing in which:

Figure 1 shows a side elevation of my invention attached to a supporting bar or the like and illustrating the perforating disc operating on paper passing over a cylinder of a printing press.

Figure 2 is a plan of the perforator taken in the direction of the arrow 2 of Figure 1, the perforator being removed from the supporting bar and the roll of the printing press.

Figure 3 is a longitudinal section on the line 3 3 of Figure 1 illustrating the perforating disc assembly in side elevation.

Figure 4 is a transverse section on the line 4 4 of Figure 3 in the direction of the arrows.

Figure 5 is a transverse section on the line 5 5 of Figure 3 in the direction of the arrows through the ball bearing assembly for the perforating disc, this being on an enlarged scale.

Figure 6 shows an alternative mounting of the perforator on an adjustable angle shaped supporting bar.

Figure 7 is an elevation of a non-pivoted mounting for the perforator.

In my invention the perforator as a whole, designated by the numeral II, employs a carrier or holder I2 which is shown somewhat in the form of a rectangular block with a groove I3 in one side, with ribs I4 extending into the groove, such groove being dened by the base portion I5 at the bottom and the top portion I6 of the holder block, this being such that the groove provides a space in which is accommodated a transverse bar I'I which may be a brush bar or similar bar used in connection with the printing press extending transversely adjacent a press cylinder. The carrier or holder is clamped. to the bar I 6 by means of the set screws I8. The opposite side of the holder block is provided with a recess I9 with ears 20 on opposite sides of this recess. The block has a sloping surface 2I on the back of the portion I6 and a vertical surface 22 formingr the base of the recess lil.

A pivoted upper block 25 has an upper part 26 with a longitudinal square opening 21 extending therethrough from the front face 28 to the rear face 29. This block has parallel sides SUI and has a dependent end structure Si through which the pintle pin t2 extends, this pin being mounted in the ears 25 of the lower block. This lower portion has a front sloping surface 33 conforming somewhat to the slope 2l on the lower block. There is a transverse slot 34 intersecting the square opening 2l. means of an adjusting screw 35 which extends through the lower portion of the block being threaded therein except for convenience a recess 36 is provided for a major portion of the screw, such screw has a curved head 3'! and is locked by a lock nut 38. The inner end of the screw is adapted to engage the vertical base 22 of the recess i9 slightly below the sloping surface 2|. A compression spring 39 is seated respectively in a recess il@ in the portion ES of the lower block and a recess il on the underside of the block 25 adjacent its front end 28.

A shank l5 extends vthrough this opening 2l.

Such shank has a portion indicated 46, square' in cross section, and threaded on, the corners lll. These threads are engaged by an impression nut d8 fitted in the transverse slot 34 and by a lock nut 39, this latter being at the outer end of the shank, there being preferably a split lwasher 50 between the nut i9 and the rear face 29 of the block 25. The outer end of the shank t5 has a yoke 55 with two arms 5S, these being illustrated as having bosses 5l facing each other and through these bosses extends the axle pin 58 having a head 5@ with a kerf therein, a threaded end 60 with a nut 5l.

The ball bearing assembly structure for the perfcrator defined by the assembly numeral 65, employs an inner ball race E@ fitting on the shaft bolt 53, an outer race El with the anti-friction balls therebetween. A cover sleeve 69 ts over Y a roll or drumtl.

the outer race and outside of this is a collar lll. These parts of the ball bearing are purchased and obtained as a unit. To this unit I secure a sleeve 'II which sleeve has a cylindrical part '12, the outer portion of which is exteriorly threaded as indicated at lll .and there is an annular flange '14. A removable ring or flange 'i5 is threaded on the threads "i3, there being sockets 'l5 in these flanges for a spanner wrench whereby the perforating ring or disc 8f3 is clampedbetween the two flanges. The inner periphery iii of this ring preferably has a snug fit on the cylindrical portion ofthe sleeve 7l. A pin 32 on the fixed flange extends through a vperforation. 83 in the perforating ring and prevents this from rotating independently of the outer race of the ball bearing. Ihe perforating edge 85 of the perforator disc or ring is cut to a sharp peripheral edge with spacer slots B5. With my invention it will be readily apparent that these wheels or perforating discs may thus be readily changeable having a different number of slots to the inch of the periphery, that is, the inch of paper perforated. I provide for purchase perforating wheels having 2, 3, 4, 6, 8 and I2 slots to the inch, however, the 8 to the inch slotted vwheels are those most commonly used.

In using my invention a metal band 90, preferably of steel, is clamped around the periphery of The paper to be perforated, indicatedY at '92, lies over the metal band and is thus engaged by the perforating wheels. It will The device is adjusted by` be noted by the construction of the spring 39 and the set screw 35, that a pressure downwardly on the perforating wheel compresses the spring 39 and allows the upper block 25 to tilt downwardly with the perforating wheel. This withdraws the set screw 35 slightly out of contact with the bottom 22 of the recess l5 but when the spring returns the shank and the cutting wheel to its original position, the set screw again contacts the surface 22, thus maintaining the perforating wheel in the proper position and with the proper spring pressure against the paper. It is manifest that the impress-ion nut @B and the locking nut 49 may afford an accurate adjustment of the perforating wheel in regard to the work to be done and on account of the shank being square in cross section, it is not necessary to use a key or spline to prevent rotation of the shank. On account of having the anti-friction bearing it is not necessary to lubricate the perforator and therefore there is no danger of oil marring the paper being perforated and also manifestly the perforator operates with but little friction.

In Figure 6, I show a mounting of the carrier block and perforator on the rear side of the press drum. In this case an angle bar lil has preferably a long ilange mi and a short wideV ange H32 on which the carrier or holder block l2,- is clamped. In this case the baseV portion l5 may contact one side of the long ange IQ! This bar has a pivot shaft i533 at each end and is rotatably mounted in a bracket Itl, such is indicated as secured by bolts HB5 to a portion of the frame H35 of the printing press. A set screw IQ'I is used to clamp the angle bar at any desired degree of angularity.

It will be noted that the same carrier or holder I2 and the same type of mounting for the perforator is used in Figure 1 as in Figure 6, In these figures the drum 9i rotates in the direction of the arrow IIE) of Figures l and 6. Figure 1 illustrates the perforator as being on the front or forward side of the drum and Figure 6, the perforatorrbeing on the rear side of the drum. These constructions are for installations where the drum has a slight up and down movement during the operation of printing. The spring 39 in both installations allows the perforator to slightly yield as the drum cornes down and to swing outwardly or upwardly to maintain a contact with the drum as it moves upwardly. The adjusting screw 35 gives a positive limit to the oscillating movement of the perforator. A feature of having the angle shaped bar llil is that this has increased strength over a bar rectangular in section as shown at Il' in Figure l. As it is sometimes diflicult to purchase in a commercial manner these strong angle shaped bars, they can be built up by using two bars rectangular in cross section attached together in any suitablemanner to form the angle shape. An important feature of having the bar Ill rotatably adjustable in its supporting brackets is that this may be rotated on its axis to locate vthe perforating disc in the correct position for accurate perforating of the paper passing over the drum.

Figure 7 is an elevation of an installation in which the pivoting or resilient mounting of the perforator is not necessary. In this construction I use a clamp H5 having a substantial block IIS and cooperating with this is a poivoted jaw IIT, the pivot being indicated at VI I8. It is usual for these jaws when closed to provide a cylindrical opening IIS to engage a round'barfThe block and the jaw are held in clamped `position by a In this construction the block screw or bolt |20. llt is provided with a guide opening I2| preferably square in cross section. A transverse notch |22 intersects this guide opening so that the shank 46 of the perforator assembly may extend through this guide opening and be secured in place by the impression nut 48 and the lock nut 49. By this construction on account oi' having the opening in the jaws cylindrical as indicated at H9, the clamp may be rotated on its holding bar to bring the perforator into correct position with the drum of the press. This type is used with presses in which the drum over which the paper passes does not have an up and down or similar movement.

Various changes may be made in the details of construction without departing from the spirit or scope of the invention as dened by the appended claims.

I claim:

1. A perforator for printing presses having a holder body with means for attaching same to a cross bar, said body having a bore therethrough and a notch transverse to the bore, a shank slidably mounted in the bore and having a threaded section with a nut in the notch threaded thereon, and a lock nut on the end of the shank, the opposite end of the shank being split and having a rotary perforating disc journaled therein, and means to prevent rotation of the shank in said bore.

2. A perforator as claimed in claim the holder body being formed with a lower part having a socket at the back, and an upper part pivotally mounted at the upper part of such socket, an adjusting screw extending through the upper part and engaging a face of the socket to prevent tilting of the arm part in one direction, and a spring between the upper and lower parts giving a resilient pressure on the tilting of the upper part with a shank and perforator in the opposite direction.

3, A perforator for printing presses having a holder body with upper and lower parts and means to clamp the holder body to a transverse bar, the body having a square bore therethrough and a notch across the bore, a shank square in cross section slidable in the bore, a nut in the notch threaded on the shank, a locking nut on the rend of the shank engaging one end of the body,

the shank having a split endV with a rotary perforating disc mounted therein.

4. A perforator as claimed in claim 3, the lower part of the body having a transverse notch to engage the cross bar and a vertical socket at the back, the upper part being pivoted in said socket, an adjusting screw extending through the lower section of the upper part and engaging the back face of the socket, the upper and lower sections having opposite recesses, and a compression spring tted in said recesses.

5. A perforator having a supporting structure with a shank adjustably mounted therein, the shank having a yoke, an anti-friction bearing mounted in the yoke, having an inne-r and an outer race, a sleeve structure, means securing said sleeve to the outer race, a perforating ring having y a perforating edge interrupted by transverse slots and means to attach said ring to the sleeve whereby the said ring may be disconnected from the sleeve and a replacement ring substituted therefor.

6. A perforator as claimed in claim 5, the sleeve having a flange formed integral therewith on one side and having a ange threaded on the sleeve, the two flanges forming the means for attaching the perforating ring to the sleeve.

7. In a perforator, a perforating wheel having an anti-friction bearing with an inner and an outer race, a sleeve, means securing the sleeve to the outer race, said sleeve having an integral annular iiange, a portion of the sleeve being eX- terorly threaded, a removable ring threaded thereon and forming a complementary flange, a perforating ring or disc mounted on the sleeve and clamped between the annular ange and the removable ring, said perforating ring having an annular sharp cutting edge interrupted by transverse slots.

8. A perforator for printing presses comprising in combination an angle shaped bar rotatably mounted in relation to the frame of the press, a holder mounted on the bar having a Xed and a pivoted portion, a shank adjustably mounted in the pivoted portion and a perforating disc on the shank whereby the angular position of the bar may be varied and the perforating disc adjusted to engage paper on a drum of a press.

9. A perforator for printing presses comprising in combination a bar L-shaped in cross section, brackets having means for attachment to the frame of a printing press, means to adjust said bar on its axis in the said brackets, a holder attached to the bar, a perforating disc connected to the holder whereby the bar may be rotated on its aXis to locate the disc in proper relation to the periphery of the drum of the press.

10. A perforator for a printing press comprising in combination a clamp having a block with a pivoted jaw, there being a cylindrical opening formed by the block and the jaw when in clamping relation, whereby the clamp may be adjusted on a cylindrical bar, the block having a guide opening therethrough, a shank extending through said opening and having a perforating disc at one end and means to adjust said shank in relation to the said block.

11. A perforator having a supporting structure with la shank adjustably mounted therein, the shank having a yoke, a bearing having a fixed and a rotatable part mounted in the yoke, a sleeve structure, means securing said sleeve to the outer part of the bearing, a perforating ring having a perforated edge interrupted by transverse slots and means to attach said ring to the sleeve whereby the ring may be disconnected from the sleeve and a replacement ring substituted therefor, the sleeve having an integral ange extending therefrom on one side, a removable ring threaded on the sleeve and forming a complementary flange, the ange and the ring forming means for attaching the perforating ring to the sleeve and means interconnecting the perforating ring and the sleeve to prevent rotation of the perforating ring on the sleeve.

PARK W. COWAN. 

